Teak mast collar idea... - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 09-03-2011
Senior Member
 
Join Date: Jun 2006
Posts: 398
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 9
groundhog is on a distinguished road
Teak mast collar idea...

k,
Heres my idea.
I got a bunch of teak boards..
Im gonna glue them together and make a teak block.
(simplified explanation so you can imagine better)
Then Im gonna make it into an oval doughnut shape.
Then im gonna cut it in half
Then I got two bronze hinges on order
Then im gonna put the teak block around the mast and put the hinges on and hammer in the hinge pins.
Then im gonna screw in bunches of spring blocks.

Sound good?
Will i crease my mast and make it all fall down?
groundhog
Reply With Quote Share with Facebook
  #2  
Old 09-03-2011
Irrationally Exuberant
 
Join Date: Jul 2007
Location: Northern Virginia
Posts: 1,301
Thanks: 6
Thanked 6 Times in 6 Posts
Rep Power: 8
arf145 is on a distinguished road
How is the collar being held down?
__________________
Tom K

2000 Beneteau 331
Northern Chesapeake Bay

Ambition is a poor excuse for not having enough sense to be lazy ~ Steven Wright
Reply With Quote Share with Facebook
  #3  
Old 09-03-2011
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,700
Thanks: 69
Thanked 197 Times in 189 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Deck stepped or keel stepped?
__________________
Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Reply With Quote Share with Facebook
  #4  
Old 09-03-2011
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,116
Thanks: 0
Thanked 71 Times in 62 Posts
Rep Power: 8
mitiempo will become famous soon enough mitiempo will become famous soon enough
What are you trying to accomplish?
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Share with Facebook
  #5  
Old 09-03-2011
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,700
Thanks: 69
Thanked 197 Times in 189 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
I think he's trying to create a base for turning blocks at the mast to run rigging aft....
__________________
Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Reply With Quote Share with Facebook
  #6  
Old 09-03-2011
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,116
Thanks: 0
Thanked 71 Times in 62 Posts
Rep Power: 8
mitiempo will become famous soon enough mitiempo will become famous soon enough
It won't make your mast fall down but when force is applied the teak collar will move up the mast. Better to use a metal base under the mast that is designed for these loads.
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Share with Facebook
  #7  
Old 09-03-2011
Senior Member
 
Join Date: Jun 2006
Posts: 398
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 9
groundhog is on a distinguished road
Oh....

The mast is deck stepped.
On the traverse back to the cockpit, the lines have to travel uphill over about a 10 inch rise in the cabin roof. So my idea for the collar is that the spring blocks, when standing will be at the perfect height for the lines to travel right at the cabin roof level.

I may have a set screw or two to stop upward travel.

My main concern here is the top and bottom collar edge forces trying to crimp the mast as the blocks are loaded with the lines.

I have seen pictures of metal mast collars. These are usually thin (height wise) affairs, but are anchored with multiple screws. The loading is on the screws.

Here the loading will be of the teak against the mast surface.
I think if I make it thick enough (height wise) the creasing forces on the top and bottom teak edges deminish?

Would 3 inches be too thin?

groundhog
Reply With Quote Share with Facebook
  #8  
Old 09-03-2011
Senior Member
 
Join Date: Jun 2006
Posts: 398
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 9
groundhog is on a distinguished road
.... also, it just occured to me, when loaded, the resultant force of the blocks will not be in a direction straight up the mast (worse) but in a 45 degree angle toward the cockpit and upwards...(better)

this will relieve some of the crimping forces. and turn them into more of a pulling on the base of the mast toward the cockpit.
Reply With Quote Share with Facebook
  #9  
Old 09-03-2011
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,116
Thanks: 0
Thanked 71 Times in 62 Posts
Rep Power: 8
mitiempo will become famous soon enough mitiempo will become famous soon enough
Bolts, not multiple screws.

What kind of boat? When tightening the halyard a lot of force is taken by the mast collar - it has been known to lift decks if attached in that manner. Any set screws will dig into the teak and not be very effective.
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Share with Facebook
  #10  
Old 09-03-2011
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,116
Thanks: 0
Thanked 71 Times in 62 Posts
Rep Power: 8
mitiempo will become famous soon enough mitiempo will become famous soon enough
It will find the weakest part, which will be the teak or whatever is holding it in place.
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
mast collar groundhog Gear & Maintenance 2 04-28-2011 09:31 PM
Mast Collar spang36 Gear & Maintenance 2 11-21-2009 01:17 PM
Mast Collar? Mizu Morgan 3 10-09-2007 02:11 PM
Mast Collar Repair PJHill Gear & Maintenance 4 07-18-2007 12:56 PM
mast collar ddilman General Discussion (sailing related) 8 04-27-2006 10:52 PM


All times are GMT -4. The time now is 06:31 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.